Outlook.com Error Sending Emails

I’ve been using Outlook.com for email for a few years now and have had very few errors, but the other day, I encountered a problem whereby I was unable to send any emails:

Couldn't send the following message

The draft email window also showed an error

The message can't be sent at the moment. Please try again later. An internal server error occurred. The operation failed.

I did some poking around and couldn’t find any causes, and couldn’t find anything online either.

I remembered I connected desktop Outlook to this email account a while ago, so I launched it and tried to send an email:

Task 'xxxx - Sending' reported error (0x8004060C) : 'The
message store has reached its maximum size. To reduce the amount of data in
this message store, select some items that you no longer need, and permanently
(SHIFT + DEL) delete them.'

This error is a lot more explicit and useful; it actually tells you what the problem is. I clicked the File tab to check sizes:

Armed with this additional information, I was able to go through my old emails and delete a couple hundred thousand freeing up half the space.

Two items in this issue have left me distinctly unimpressed:

1. The error messages from Outlook.com are totally useless; there is no hint as to possible causes of the problem.
2. I logged an issue with the Outlook.com support team clearly stating I was unable to send any email; their response was to email me asking for me to reply by email with more details.

Read original post Outlook.com Error Sending Emails at azurecurve|Ramblings of a Dynamics GP Consultant; post written by Ian Grieve (Lead ERP Consultant at ISC Software Solutions)