Although I read a lot on the forums here, I have never posted anything. Im not a real techy with my Maxx as many of you are but, my story with the JB update is worth sharing. I too got the OTA announcement for an update but like everyone else, it failed. So I decided to download it manually from the link many people are talking about (you can google it too). I downloaded it three separate times to my computer and then transferred it to my SD and then went through the steps to upload it to my phone. All three times it actually uploaded without Any problems, however, I had the exact same issue with my email sync and and constant error message to that affect. The other glitch I had immediately after this update was; I could receive texts BUT was UNABLE to SEND them. Sucked cuz I couldn't fix this problem, I pulled the SIM, rebooted countless times, downloaded the update three (finally four) times. The ultimate fix for me was this: the fourth time I downloaded the update, I put it directly on the SD card, avoiding the transfer from my desktop. Still didn't fix it so I finally did an FDR (sucked) but in the end worth it! After no success, and Verizon tech support was unable to help, I went into Verizon. He said I had done everything they would do so he was going to order me a new phone...
Here is what ultimately fixed my phone and so far, it and JB are working amazing! I asked for a new SIM Card and asked him to remove all my messaging setting from my account which he did as I asked. Installed the new SIM reset all my messaging rebooted the phone, now, my phone works awesome!!! Hope this helps!