This. I've been looking for a new Exchange client since Outlook Web stopped properly supporting Firefox. I reached immediately for Thunderbird, but switched away quickly because of the need to pay for (somewhat clumsy) Exchange integration. If Owl were free, I wouldn't mind the long delays or weird synchronization issues. As a subscription service, I'll take my business elsewhere.
What specific long delays or weird synchronization issues do you experience? I just bought the plugin but don't notice any yet with ~7000 mails.
Did you find a good alternative? I read above that using DavMail as a proxy can also work.
OWA has a known issue with Firefox on Linux where it incorrectly believes that Ctrl is pressed while typing an email. This results in frequent missed characters and spurious actions, including moving focus to the search bar, archiving messages, saving the current message as a draft and closing it, etc. This makes OWA extremely frustrating to use. Another issue with OWA is the unhelpful completions (which I've noted before on HN), which in my experience seem to be related to the spurious actions (more suggested completions = more spurious actions)
