Outlook 2013 not showing emails older than aprox. 6months old in any folders

try running outlook with one of the following commands

/resetnavpane
/cleanviews
/cleanrules (this will delete all rules of all mailboxes - attention!)

if that doesn't help

• try opening Outlook in safe mode to disable 3rd party add-ins
• Turning cached mode on/off
• create a new profile

The new profile will set outlook back to default settings.

if that doesn't help, deinstall the latest windows updates.

cheers!

This isn't something that is available in unmodified Exchange, much less Outlook. I have accomplished the exact same thing in two ways.

1) We use IronPort ESA filters/SMTP nodes to accept mail. You can write a rule at this level to do what you are asking before delivering to Exchange. The idea is simple enough and many mail filters will have similar capabilities. Have a mail content rule that triggers if the sender is 'GMS' and body contains serial number 'xyz' (lots of rules, one for each SN); the action is to modify the envelope-sender address to your desired address. Do be wary that you are talking about modifying to an address with a domain that is sounds like you don't control. Depending on where in the process your filter performs sender verification & anti-spoof/spam your alteration of the from address may cause failures to deliver. Just be mindful that there may be additional changes this requires.

2) I have written a custom SMTP Mail Transfer Agent in .Net, my code was to strip & re-route attachments (we didn't want large attachments living in our Exchange server, so the ESA would send emails over a certain size to my MTA that would move the attachments to a file server and insert links to the offloaded files into the message body). You can do the same thing, get a custom MTA that reads the body and changes the from address based upon some lookup information. "If SN matches devices.SN then set From as devices.ContactEmail" type process. You'll need someone to do the coding for you (assuming that isn't in your skillset, if it is, boom, you're all set). Then your MTA just hands the re-written output to the Exchange inbound connector.

No, you can't do this in native Exchange (and especially in Exchange Online, where changing FROM address to non-authoritative domains is a pretty frowned upon thing). But it can be done.