Outlook has exhausted all shared resources, please close all messaging applications and restart Outlook

Question

How to resolve "Outlook has exhausted all shared resources, please close all messaging applications and restart Outlook"

Answer 1

Thanks for posting your question in the Microsoft Q&A forum.

I hope one of these steps can assist you:

1. Close any other messaging applications running on your system, such as Skype for Business or Teams, and then restart Outlook. This can help free up the shared resources that Outlook is exhausting.
2. Reduce the number of PST files or mailboxes connected to Outlook. The error is often caused by Outlook having to manage too many large PST files. Try consolidating your email accounts into fewer PST files.
3. Adjust the cache size settings for your PST files. You can try adding the "UseLegacyCacheSize" registry key to control the cache size, but be careful as this can also cause Outlook to fail to start.

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