We have had a few customers report that they are able to log into their webmail, but after a minute or so they get the error "Safari web content quit unexpectedly". What we have been able to determine is that this happens only Yosemite with Safari 8 and is caused by a calendar notification.
The easiest solution that we have to get around this problem is to use Google Chrome. If you wish to continue to use Safari then I suggest that you change OWA to load in the Lite Version.
To load OWA in the lite version:
- Log into your webmail
- Click Options
- Click General
- Check the box for "Use the blind and low vision experience"
- Log out and close the browser
I suggest that you perform this on a computer that doesn't experience this issue, but you may be able to load Options in Safari before it the notifications prompt.
This has been submitted to Apple under Bug # 20535106
CAC access to secure web sites for Mac OS
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After some additional testing we found that the latest version of Safari, v8.0.5, no longer experiences this issue. Please update your Mac to the latest updates if you are experiencing a Safari crash.