Outlook users beware — Classic Outlook is currently crashing when you open more than 60 emails at once

Microsoft Outlook
(Image credit: Shutterstock)

Earlier this week, Microsoft confirmed reports of an issue with the Classic version of Microsoft Outlook, wherein users who open more than 60 emails simultaneously are being faced with crashes. This may sound like a fringe use case, but for users who need to comb through large volumes of mail on a regular or semi-regular basis, having such an arbitrary limit forced onto Outlook Classic (especially when system specifications should be able to handle 60+ emails just fine) is still a problem.

The two error messages Microsoft mentions are:

"Sorry, we’re having trouble opening this item. This could be temporary, but if you see it again you might want to restart Outlook. Out of memory or system resources. Close some windows or programs and try again."

“Out of memory or system resources. Close some windows or programs and try again”.

While the error message implies that system resources are being taxed too hard, Microsoft revealed in its blog post that the crux of the issue can be narrowed down to a Windows Registry setting, USERProcessHandleQuota. The default value is "10000" Decimal, and setting it to "18000" Decimal should, in theory, allow the system to use up more system resources — but this fix is also noted as potentially causing deeper system instability and "additional strain on the operating system".

So, in the interim, Microsoft is recommending that users either avoid opening that many emails at once or wait for the Outlook team to fix the issue. You can do the riskier Registry Key editing if you so please, but we would only advise doing so if you're confident that your system can handle the additional toll that changing USERProcessHandleQuota may incur.

Overall, this story is a fairly standard bug reporting affair, but fans of Microsoft and its software may not be happy to see issues like this still emerging in software that should have been long-ironed out of instability, such as Outlook Classic. Hopefully Microsoft's Outlook team will fix this issue sooner rather than later, since a user's actual system specifications should be all that limits them on PC — not bugs in application coding.

Christopher Harper
Contributing Writer

Christopher Harper has been a successful freelance tech writer specializing in PC hardware and gaming since 2015, and ghostwrote for various B2B clients in High School before that. Outside of work, Christopher is best known to friends and rivals as an active competitive player in various eSports (particularly fighting games and arena shooters) and a purveyor of music ranging from Jimi Hendrix to Killer Mike to the Sonic Adventure 2 soundtrack.

  • Krieger-San
    All the more reason to switch to Thunderbird ;)
    It'll also mean no more Office AI crap features that stream all your data through MS cloud datacenters.
    Reply
  • hotaru251
    ......who in the heck is opening 60 at once????
    Reply
  • USAFRet
    hotaru251 said:
    ......who in the heck is opening 60 at once????
    I can almost see if with a mass mailer or pork product distributor.

    But avoiding this just means a change in workflow.
    Not necessarily a whole new email client.
    Reply
  • newtechldtech
    hotaru251 said:
    ......who in the heck is opening 60 at once????
    Automated bots. email mergers , etc
    Reply
  • Viking2121
    Browser I always found works better than the Outlook app anyway lol
    Reply
  • kyzarvs
    Outlook was always the outlier for me that keeps me in MS - I moved to it over 20 years ago from Pegasus Mail (anyone remember that?!). As I have to deal with a lot of mail (and I own a mail-hosting business), I've tried all sorts of apps and sites and never found anything as remotely good as Outlook for getting through a boat-load of mail quickly.

    2010-2019 was great, the latest versions from O365 are just awful, buggy messes that have numerous graphical glitches (on my Intel / nVidia laptop and AMD / AMD desktop and my work laptop), frequent crashes and hangs. Genuinely the last thing that keeps me as a MS user for home and it's falling apart. The web version is also very poor for working with large amounts of mail, I'm genuinely not sure what I'll use once 2019 is no longer supported.
    Reply