sent Items

[Joe]

my sent items folder is only keeping sent email for a week, how can I change that so that its longer than a week?.
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[Roady [MVP]]

Hard to say at this level of detail. Outlook doesn't delete messages on its
own. Do you perhaps have AutoArchive enabled?
Tools-> Options...-> tab Other-> button AutoArchive...

 

[Brian Tillman [MVP-Outlook]]

my sent items folder is only keeping sent email for a week, how can I change
that so that its longer than a week?.

What view have you chosen for that folder?