Exchange 2013 email retention

Hi experts,

We are requested to deploy a email retention policy to reduce the size of the end users mailbox.

The goal is to automatically delete all emails older than 90 days out of the end user mailbox if these emails are not flagged by the end user.

I see a lot of issues with this request and I do not believe this is the right approach.

If this even possible and how would  I approach this task?

Have you done anything similar to the above?

Please let me know your thoughts.

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Tom CieslikIT EngineerCommented:
I don't think this is possible.
You can deleted emails older than....... but you can't depend this policy to no work if user will flag email

I think the best approach is auto archiving policy.
If you do archive on server level using policy, then all emails will go to special archive.
First you need to create retention tag, then create retention policy based on this tag

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ChrisSenior Technical ArchitectCommented:
as Tom suggests the archive tags are the way to manage this, unless they tag it after 90 days it gets moved to the archive and you could script the deletion from there.
i would definitely not do this, with GDPR and similar information requests Compliance teams are generally moving towards keeping everything as long they can, 5 years, 7 years for example.

Depending on what the real driver is behind the requirement there are other ways of resolving the issue i.e. archive mailboxes on cheaper storage
Jeff GloverSr. Systems AdministratorCommented:
You can have a retention policy but be warned, you need to make sure legal is fully up on it. If you are under any and I mean any Government regulations (HIPPA. FERPA, etc....,) you may have retention/discover requirements you don't even know about. If you have a SAN,NAS or other type of storage, I would setup an Archive mailbox for each and a rule to move mail older than 90 days there. You can, if needed, use retention tags and a retention policy to delete mail after a certain time but I would never use something as small as 90 days as the limit.
TeavanaAuthor Commented:
Thank you all for your responses, I appreciate it.  My thinking is in line with yours and these are some of the concerns I raised when this topic was brought out.

TeavanaAuthor Commented:
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