A couple updates:
First, and most importantly, we're listening to your feedback. Lots of people voiced an opinion about the new logout destination being inconvenient for them or otherwise undesirable. So we're adding an option to allow you to control that. If you want to have the old behavior of returning to the login page, you'll be able to do that. That option should be ready sometime in June. Thanks to everyone who commented on the change.
Secondly, we have fixed the issue that started yesterday, where links in some HTML emails were not clickable. That should now be be working again in all cases. Let me know if any problems remain.
And lastly, there are a couple other changes on the horizon that affect the impact of advertisements when using Web Mail. The change to the ad position yesterday got a mixed reaction, with some users liking it and some not. In Web Mail 6.0 (see preview here) you will have the ability to hide the left panel and gain a lot of horizontal real estate for your Inbox content. That recovers any width lost to the new ad position, and then some. And yes, I can confirm now that we will have an upgrade option in a few months that will provide an ad-free Web Mail. Look for more information on that later.
Thanks again for all the feedback.