I have a user that is trying to save an email message in outlook 365 connected to exchange 2010 without cache mode. The email contains a trail of several replies and attachments resulting in the size being 990KB
When they try to save the message to their desktop or a network share the operation fails with the error "there is not enough memory available to perform the operation"
So far searching has pointed to
https://support.microsoft.com/en-ie/help/2968387/you-receive-insufficient-memory-errors-when-you-expand-a-mailbox-or-pu
But this isn't a match for the users configuration.
I've also tried increasing the page file size but this hasn't resolved the issue either.
I can't find a limit to saving an email in Outlook/Exchange, and appreciate if anyone who has come across this issue previously can share their solution.
Edit.
Appears to be an issue with the size of the attached outlook items.
The user in question has been sent a mail with 33 attached outlook mail items, and six documents as separate attachments.
I can reproduce the error, but with a higher number of smaller attached outlook mail items, 50 in my case and the same number document attachments.
Best Answer
I have found that outlook 365 are not supported for exchange 2010, here's a microsoft official article for your reference: Clients