Keep Getting "Outlook closed while you had items open. Reopen items from last session?" Even Though It's Not True

Anonymous
2023-07-05T13:34:20+00:00

This just started happening. Whenever I open Outlook, I get the message "Outlook closed while you had items open. Reopen items from last session?" even though this is not true -- I did not have items open when I closed Outlook. Using Windows 11. Screenshot of what version of Outlook I have:

Outlook | Windows | Classic Outlook for Windows | For business

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Anonymous
2023-07-07T17:46:51+00:00

I'm on build 2306. Is this the reg key in question?

HKEY_CURRENT_USER\Software\Microsoft\Office\16.0\Outlook\Preferences
DWORD: ReopenWindowsOption
Value: 1

Yes.

Some users that updated to 2306 have reported that the key was not already in the Registry and had to add it and the value.

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  1. Anonymous
    2023-10-15T14:21:43+00:00

    Microsoft appears to have resolved this issue at some time in the last week or so. In my current build of Outlook Professional Plus 2021 - Version 2309 (Build 16827.20130 Click-to-Run) - the three options of how to handle previously open items have been restored to the "Start-up Options" section of the "General" Outlook Options dialogue box.

    The value of the "ReopenWindowsOption" DWORD now appears in the Registry and varies depending on the option selected - 0 for "Ask", 1 for "Always Open" and 2 for "Never Open". A missing instance of this DWORD has the same effect as the value "0". Changing the selection then returning it to "Ask" will leave an explicit registry entry with value "0".

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  2. Anonymous
    2023-09-30T13:58:22+00:00

    O.K. Thanks!

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  3. lmacri 2,505 Reputation points
    2023-09-30T13:32:26+00:00

    Microsoft® Outlook® 2021 MSO (Version 2309 Build 16.0.16827.20130) 64-bit, & Windows 11 Home 22H2

    Hi Ted William Hassing:

    Just a hint for future reference. When you report your MS Office version and build in forums be sure to use the version information displayed at File | Office Account beside the About Outlook / About Excel / About Word buttons as shown below. This is the version and build number used in the release history for retail versions of MS Office 2021 at https://learn.microsoft.com/en-us/officeupdates/update-history-office-2021#retail-versions-of-office-2021 and the release notes for the Current Channel release channel at https://learn.microsoft.com/en-us/officeupdates/current-channel.

    Image

    I don't know why, but when you click the About Outlook / About Excel / About Word buttons the build number shown in the pop-up window does not always match the "correct" build number displayed beside the button. For example, here's an old image I captured on 04-May-2022 showing a mismatch in build numbers for Version 2204 (Build 15128.20178).

    Image

    Dell Inspiron 5584 * 64-bit Win 10 Pro v22H2 build 19045.3448 * Firefox v118.0.1 * Microsoft Defender v4.18.23080.2006-1.1.23080.2005 * Malwarebytes Premium v4.6.3.282-1.0.2158 * Macrium Reflect Free v8.0.7279 * MS Office Home and Business Version 2309 / Build 16827.20130 Click-to-Run

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  4. Anonymous
    2023-09-29T22:50:53+00:00

    Did al that, error still remained after that but then magically a fix occurred!

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