We have a number of shared mailboxes in my organisation. These are used for competition entries, nominations etc and have someone administering them.
However it appears that emails that have been received into these mail files are automatically being deleted after a period of time.
For example one of the people who looks after a comp account will create sub folders within the mail file, such as;
1. Winners
2. Prize Draw
3. Losers
They will divide the mail up between them depending on the answers. When they revisit this mail file after a number of weeks the folders and emails have been deleted. We can normally rescue the mail by recovering deleted items but obviously lose the folder structure.
We have also had instances (such as today) where we've lost all entries to comps and been unable to recover anything.
I spoke to Microsoft a while ago about this who advised me to change the retention policy on the shared mail box to [No policy] which is the same as the majority of our user mailboxes. However this hasn't resolved the issue.
Am I missing something glaringly obvious?