Community Center | Not monitored
Tag not monitored by Microsoft.
58,082 questions
2 answers
One of the answers was accepted by the question author.
Certificate of Completion?
I completed all of the requirements for the Microsoft Certified: AI Transformation Leader certification. My manager has asked me for a copy of my certificate, but I have not been able to find anything to download and share. Is there something available…
Community Center | Not monitored
asked
2026-09-17T21:28:35.5066667+00:00
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(83.2, 84%, 18%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EBU%3C/text%3E%3C/svg%3E)
Brian Uhelski
20
Reputation points
accepted
2026-09-17T21:48:47.1033333+00:00
Brian Uhelski
20
Reputation points
1 answer
I HAVE TO MANY VIRIOUSS!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
I HAVE 100S OF VIRUSES AND KEEP GETTING BITCOIN MINERS!!!!!!!!!!!!!!!! PEASE HELP,,,, MY COMPUTER FROUM 2016 IS GOIGN TO DIEEEEEEEEEEEEEEEEEEE signed, your mom
Windows for home | Other | Security and privacy
2,814 questions
asked
2026-09-17T20:59:54.87+00:00
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(291.2, 42%, 38%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EEC%3C/text%3E%3C/svg%3E)
Eaton, Calista
0
Reputation points
answered
2026-09-17T21:46:37.86+00:00
Bulldog
4,740
Reputation points
2 answers
I was doublebilled via 2 different credit cards. I need a refund, and it STILL keeps telling me I need to renew. WON'T WORK
I was double charged for my 365 subscription. Once on June 2, 2026 through Apple, and once on September 17th through Discover. (and it still keeps telling me I have to renew (not working)). I need a refund.
Microsoft 365 and Office | Subscription, account, billing | For home | iOS
Microsoft 365 and Office | Subscription, account, billing | For home | iOS
Microsoft 365 features that help users manage their subscriptions, account settings, and billing information.
417 questions
asked
2026-09-17T21:07:10.9266667+00:00
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(169.60000000000002, 66%, 26%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EMS%3C/text%3E%3C/svg%3E)
MONICA SWED
0
Reputation points
answered
2026-09-17T21:44:57.2166667+00:00
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(64, 77%, 16%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ELB%3C/text%3E%3C/svg%3E)
Lester Bernard Reyes
85,500
Reputation points
Independent Advisor
2 answers
What is Microsoft Plan for upgrading SSRS Report Viewer Control to Unified .NET platform
What is the Microsoft Plan for upgrading SSRS Report Viewer Control to Unified .NET platform? Link…
SQL Server Reporting Services
SQL Server Reporting Services
A SQL Server technology that supports the creation, management, and delivery of both traditional, paper-oriented reports and interactive, web-based reports.
3,184 questions
asked
2025-03-12T20:54:28.5033333+00:00
Ambar Prajapati
0
Reputation points
answered
2026-09-17T21:44:07.25+00:00
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(211.20000000000002, 61%, 30%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EBS%3C/text%3E%3C/svg%3E)
Bruce (SqlWork.com)
85,456
Reputation points
2 answers
outlook and icloud calendars aren't syncing
Outlook for Windows on my PC is no longer syncing with my iCloud calendar. If I enter an apt in outlook it shows immediately in my iphone calendar. If I enter a new apt on the iphone it does not show up in outlook. It was working a few days ago. I…
Outlook | Windows | Classic Outlook for Windows | For home
Outlook | Windows | Classic Outlook for Windows | For home
Using Classic Outlook on Windows for personal email, calendar, and contact management
32,768 questions
asked
2025-11-07T17:52:43.5733333+00:00
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(201.6, 61%, 29%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ECB%3C/text%3E%3C/svg%3E)
Carlynn Bock
0
Reputation points
answered
2026-09-17T21:41:32.61+00:00
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(44.800000000000004, 96%, 14%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EA%3C/text%3E%3C/svg%3E)
Ash
0
Reputation points
2 answers
One of the answers was accepted by the question author.
how to hydrate a projected file system file (Projfs)
I have a implementation of a projfs provider but i am trying to implement a hydrate function that converts a placeholder to the a Hydrated placeholder. https://learn.microsoft.com/en-us/windows/win32/projfs/projfs-functions There does not appear to…
Windows development | Windows API - Win32
3,043 questions
asked
2026-08-20T23:42:38.4766667+00:00
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(176, 42%, 27%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EPJ%3C/text%3E%3C/svg%3E)
Pribele, Joe
20
Reputation points
accepted
2026-09-17T21:40:46.48+00:00
Pribele, Joe
20
Reputation points
2 answers
How to removed 2 old Office 365 accounts?
I need to remove 2 old versions of Office 365, one from an old personal email address, and one from a previous employer.
Microsoft 365 and Office | Other
Microsoft 365 and Office | Other
Miscellaneous topics that do not fit into specific categories.
9,237 questions
asked
2026-09-17T20:56:56.01+00:00
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(140.8, 11%, 23%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EJL%3C/text%3E%3C/svg%3E)
Jayne Labes
0
Reputation points
answered
2026-09-17T21:34:16.2+00:00
EmilyS726
269.5K
Reputation points
Independent Advisor
1 answer
Photo deleted
I am not looking for a setting or feature inside the OneDrive mobile app. I am contacting support to request a server-side investigation and potential data recovery from Microsoft's back-end backups. Here is the situation: Issue: A large set of photos…
Microsoft 365 and Office | OneDrive | For home | Android
Microsoft 365 and Office | OneDrive | For home | Android
A Microsoft file hosting and synchronization service.
1,172 questions
asked
2026-09-17T12:12:26.9+00:00
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(275.2, 65%, 36%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ENR%3C/text%3E%3C/svg%3E)
Narges Rahmati
0
Reputation points
answered
2026-09-17T21:33:23.5933333+00:00
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(144, 7.000000000000001%, 23%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EHC%3C/text%3E%3C/svg%3E)
Haytham-C
5,550
Reputation points Microsoft External Staff
Moderator
1 answer
One of the answers was accepted by the question author.
Request for Assistance – MFA Lockout and Account Recovery
I am locked out due to missing Authenticator access and cannot open a support case or access the admin center. My organization is just myself with this one account, so it is a tenant lockout. Initial post:…
Microsoft Security | Microsoft Entra | Microsoft Entra ID
Microsoft Security | Microsoft Entra | Microsoft Entra ID
A cloud-based identity and access management service for securing user authentication and resource access
31,265 questions
asked
2025-05-13T20:04:40.7533333+00:00
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(284.8, 87%, 37%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EJD%3C/text%3E%3C/svg%3E)
John Doe Customer
20
Reputation points
commented
2026-09-17T21:32:43.12+00:00
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(118.4, 28.999999999999996%, 21%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EJR%3C/text%3E%3C/svg%3E)
Jerry Rehor
0
Reputation points
2 answers
Teams leaving frozen window copy of teams on Mac OS
I'm running Mac OS 26.0.1 (25A362) and teams version 25255.703.3981.5698. Recently since updating Mac OS and teams, teams leaves a screen shot of the teams meeting/session in the background which can't be closed. The teams meeting works fine but it…
Microsoft Teams | Microsoft Teams for business | Teams for Mac
Microsoft Teams | Microsoft Teams for business | Teams for Mac
Using Microsoft Teams on macOS, including installation, features, and compatibility
924 questions
asked
2025-10-12T15:00:58.0233333+00:00
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(70.4, 40%, 16%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ERP%3C/text%3E%3C/svg%3E)
Richard Pepper
20
Reputation points
edited a comment
2026-09-17T21:32:38.16+00:00
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(12.8, 55.00000000000001%, 11%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ESY%3C/text%3E%3C/svg%3E)
Song, Yucheng
0
Reputation points
1 answer
One of the answers was accepted by the question author.
URGENT: Tenant Lockout – Sole Admin Blocked by MFA – Requesting Data Protection Escalation
Hello, My name is Roberto Gallardo Flores. I am the only Global Administrator of a Microsoft 365 tenant and I am completely locked out due to MFA. Unfortunately, I have lost access to the Microsoft Authenticator app and did not configure any backup…
Microsoft Security | Microsoft Entra | Microsoft Entra Private Access
Microsoft Security | Microsoft Entra | Microsoft Entra Private Access
Providing secure, identity-based access to private apps and resources without traditional VPNs
170 questions
asked
2025-05-12T22:26:22.3466667+00:00
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(284.8, 19%, 37%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ERG%3C/text%3E%3C/svg%3E)
Roberto Gallardo Flores
20
Reputation points
commented
2026-09-17T21:30:57.4166667+00:00
Jerry Rehor
0
Reputation points
3 answers
Return Index / Address of Multiple Values' Locations in a 2D Array
Hi all, I have a table of Values with multiple rows and columns, each column with a header that indicates a Group. Each column shows which Value has been assigned to which Group, and can have any number of Values within it. For example: On a second…
Microsoft 365 and Office | Excel | For business | Windows
Microsoft 365 and Office | Excel | For business | Windows
A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data
21,036 questions
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(6.4, 22%, 10%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EJ8%3C/text%3E%3C/svg%3E)
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(48, 32%, 14%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EJT%3C/text%3E%3C/svg%3E)
2 answers
Microsoft rewards verification problems.
Hi. I am currently experiencing issues with verifying my Microsoft rewards account I cannot use my phone number to sign in, so I downloaded the Bing app to enter the code provided on the website to verify. The problem is that there is no verify account…
Bing | Microsoft Rewards
Bing | Microsoft Rewards
A program that grants points for using Bing search, which users can redeem for gift cards, sweepstakes entries, or charitable donations.
8,432 questions
asked
2026-09-17T20:53:37.9066667+00:00
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(60.8, 71%, 15%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3ECW%3C/text%3E%3C/svg%3E)
Connor West
0
Reputation points
answered
2026-09-17T21:28:05.0566667+00:00
Lester Bernard Reyes
85,500
Reputation points
Independent Advisor
0 answers
Tenant lockout, both Global Admins, AADSTS50196 security-info registration deadlock, case 2608190040008441 stalled 6 days
Requesting moderator assistance getting an existing Data Protection / Tenant Recovery case internally escalated. Situation Both Global Administrator accounts on a Microsoft-direct production tenant have been locked out since 8/19/2026. Normal users…
Microsoft Security | Microsoft Entra | Microsoft Entra ID
Microsoft Security | Microsoft Entra | Microsoft Entra ID
A cloud-based identity and access management service for securing user authentication and resource access
31,265 questions
asked
2026-08-24T17:25:41.45+00:00
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(128, 8%, 22%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EA%3C/text%3E%3C/svg%3E)
Anonymous
commented
2026-09-17T21:27:46.79+00:00
Jerry Rehor
0
Reputation points
0 answers
StartTraceW custom system logger: SeSystemProfilePrivilege present but disabled
On Windows build 26200.9457 (DisplayVersion 25H2), consider an elevated Administrator caller whose token contains SeSystemProfilePrivilege, but that privilege is Disabled. This is a direct StartTraceW custom controller, not WPR; the controller does not…
Windows development | Windows Performance Toolkit
186 questions
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(156.8, 79%, 25%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EA%3C/text%3E%3C/svg%3E)
1 answer
our website is showing permanently closed when is is not closed
When I search in Edge for our office website, it takes us to bing and shows a big red icon at the top of our search saying the office is permanently closed when the office is fully open. How can I fix this issue
Bing | Search | Unexpected search results
Bing | Search | Unexpected search results
Outcomes that are irrelevant or not aligned with the user's query, often requiring refinement of search terms.
408 questions
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(195.2, 25%, 28%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EN%3C/text%3E%3C/svg%3E)
1 answer
Microsoft Publisher 2019
I use Publisher 2019 for the the village newsletter, posters etc. I am considering upgrading to 2024 but Publisher is not supported. I have 100's of publisher files - if I upgrade will I be able to continue using Publisher 2019?
Microsoft 365 and Office | Publisher | For home
Microsoft 365 and Office | Publisher | For home
A desktop publishing application from Microsoft that focuses on page layout and graphic design.
1,090 questions
asked
2026-09-17T20:18:47.4766667+00:00
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(198.4, 3%, 29%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EJA%3C/text%3E%3C/svg%3E)
Jim Ashford
0
Reputation points
answered
2026-09-17T21:26:47.3233333+00:00
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(291.2, 38%, 38%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EMP%3C/text%3E%3C/svg%3E)
Marcin Policht
109.5K
Reputation points MVP
Volunteer Moderator
1 answer
copilot unavailable
when will copilot be working again today? i have been working on a project with a deadline and i need to complete it asap. in addition, several times i've lost my chat and have had to start all over again. how can you fix that
Microsoft Copilot | Microsoft 365 Copilot | Development
Microsoft Copilot | Microsoft 365 Copilot | Development
Building and customizing solutions using Microsoft 365 Copilot APIs and tools
1,754 questions
asked
2026-09-17T19:46:18.25+00:00
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(192, 6%, 28%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EAO%3C/text%3E%3C/svg%3E)
adele oxee
0
Reputation points
answered
2026-09-17T21:24:28.7833333+00:00
Gérard Oomens
132.3K
Reputation points
Volunteer Moderator
0 answers
Tenant-wide PTA authentication outage, all admins locked out, AADSTS80002, Data Protection cases stalled 5+ days
Requesting moderator assistance escalating an existing Data Protection / Tenant Recovery case. Situation: A production Microsoft 365 tenant (church organization, 572 users) has been in a complete authentication outage since September 12, 2026. The tenant…
Microsoft Security | Microsoft Entra | Microsoft Entra ID
Microsoft Security | Microsoft Entra | Microsoft Entra ID
A cloud-based identity and access management service for securing user authentication and resource access
31,265 questions
asked
2026-09-17T21:24:22.4166667+00:00
Jerry Rehor
0
Reputation points
asked
2026-09-17T21:24:22.4166667+00:00
Jerry Rehor
0
Reputation points
1 answer
how to fix copilot from saying I'm sorry having trouble
i'm sorry i m having trouble responding requests right now. Let's try this again in a bit.
Microsoft Copilot | Other
2,205 questions
asked
2026-09-17T19:52:04.55+00:00
![](data:image/svg+xml, %3Csvg xmlns='http://www.w3.org/2000/svg' height='64' class='font-weight-bold' style='font: 600 30.11764705882353px "SegoeUI", Arial' width='64'%3E%3Ccircle fill='hsl(112.00000000000001, 80%, 20%)' cx='32' cy='32' r='32' /%3E%3Ctext x='50%25' y='55%25' dominant-baseline='middle' text-anchor='middle' fill='%23FFF' %3EWS%3C/text%3E%3C/svg%3E)
Walter Schultz
0
Reputation points
answered
2026-09-17T21:24:04.2766667+00:00
Gérard Oomens
132.3K
Reputation points
Volunteer Moderator