"There is not enough free memory to run this program" error in Outlook

Question

Dear All,
We have tried all the solution for this. How ever issue still remain for an specific mailbox. How ever this is an shared mailbox already outlook is configured in 36 pc. When configuring in an new PC this issue is occurring.

https://learn.microsoft.com/en-us/outlook/troubleshoot/performance/insufficient-memory-errors-when-expanding-mailbox-or-public-folder
https://www.datanumen.com/blogs/4-solutions-outlook-error-memory-system-resources/

Answer 1

Hi @Rafiul Islam

According to your description above, your issue seems only to be related to this specific shared mailbox, have you verified will the issue recur if adding a newly created shared mailbox? And are you using on-prem Exchange server or Exchange online?

From outlook side, this article provided another method increase available memory by modifying the registry: "There is not enough free memory to run this program" error in Outlook

Important:
Follow the steps in this section carefully. Serious problems might occur if you modify the registry incorrectly. Before you modify it, back up the registry for restoration in case problems occur.

If the solution above not work for you, you could also try moving this shared mailbox to another database, which will repair the issue of the mailbox.

New-MoveRequest -Identity shared -TargetDatabase "DB02" –BadItemLimit 10  

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Answer 2

To resolve this issue by disabling the ” button and choose other Cached Exchange Mode.