I think this has been fixed. In my SMS messages, I have messages with the following dates:

2/4/16

2/5/16

2/6/10

2/7/10

Is is possible that Sprint pushed a fix out for this to my phone without me knowing it? Or am I hallucinating?

Thanks for the update, Kathleen. I know that HTC created hotfixes for the more recent Sprint devices, such as the TouchPro2, but I thought the real issue was something on the mobile operator's end with how SMS messages were transmitted... So perhaps Sprint fixed the real issue that was affecting phones on their network...

Apparently I was hallucinating    The soft reset might have fixed a few of the messages, but the problem continued. Palm released a fix today, which I have applied to my phone. Palm says: "It will also correct the date of any SMS messages you have already sent or received that display the wrong year." It did fix most of the existing messages, but a thread I have going with my daughter is still out of order. I'll wait until I get another text message from her or someone else before I can say that this really worked.