Cursor becomes smaller in Office apps.

I have the exact same problem. I'm running a UHD monitor at 3840x2160. It started a few days ago, then disappeared after a manual windows update. It returned the next day. After a display driver update from Nvidia it went way for a day, then returned.

It effects Word and Outlook, but not Powerpoint or Excel.

It also effects a drawing program I use called Corel Designer, which is really annoying.

It's clearly a bug linked to display driver problems and the cursor files a program selects.

If anyone finds a permanent solution please post it here!

I have the exact same problem. I'm running a UHD monitor at 3840x2160. It started a few days ago, then disappeared after a manual windows update. It returned the next day. After a display driver update from Nvidia it went way for a day, then returned.

It effects Word and Outlook, but not Powerpoint or Excel.

It also effects a drawing program I use called Corel Designer, which is really annoying.

It's clearly a bug linked to display driver problems and the cursor files a program selects.

If anyone finds a permanent solution please post it here!

I'm sorry you're also having this problem.  I agree that I see the issue in Outlook and Word.  I too have never noticed it in Excel.  It does appear in the drawing program I use called paint.net. 

[This appears on two systems I use daily.  One is an i5, one an i7.  Both use higher end nVidia GTX cards, 3840x2160 at 150% scaling, MS Office365, optical mice with the default MS driver, and updated Windows 10.  For what it's worth...]

I had same problem with Outlook until now, just tried changing the font size to 20, back to normal 11...Magically big cursor reappeared...Try this might work for you too!!

So glad I found this thread, I'm experiencing the same issue after a fresh install of Windows 10 Pro and Office 365. Tiny cursor syndrome appears in Word and Outlook (the applications I use the most) and only when hovering over hyperlinks or italicised text. Doesn't happen in Chrome or other applications.

Strangely enough, before this fresh install, the tiny cursor syndrome didn't appear on the exact same hardware.

So glad I found this thread, I'm experiencing the same issue after a fresh install of Windows 10 Pro and Office 365. Tiny cursor syndrome appears in Word and Outlook (the applications I use the most) and only when hovering over hyperlinks or italicised text. Doesn't happen in Chrome or other applications.

Strangely enough, before this fresh install, the tiny cursor syndrome didn't appear on the exact same hardware.

Sorry you had to join us...  But welcome, nonetheless.

What resolution, scaling, video card, mouse, etc., etc., etc. are you using?  I'm still trying to see the patterns as to when this issue appears and when it doesn't...