Microsoft has been rolling out CRM 2015 for Online organizations (On-prem download can be found here) but before you perform the update you will want to review the new list of unsupported customizations in 2015 to see if you are currently using any of them.
Earlier in the year, in the 2013 SDK, Microsoft provided a list of things that will be changing in the next release which can also be found here in the MSDN. Only 3 functions are being removed, getServerUrl (use getClientUrl), isOutlookClient (use client.getClient) and isOutlookClientOnline (use client.getClientState). The Xrm.Page.ui.getFormType call will no longer return 5 for Quick Create and 11 for Read Optimized as those types of forms were removed/deprecated in earlier releases. Also be sure that your customizations are no longer using the old 2007 endpoint as it is removed in CRM 2015. To help detect if you are using the 2007 endpoint, you can run the Legacy Feature Check tool against your organizations.
Lastly, there have been some changes to the web application requirements for CRM 2015. Support for IE8 and IE9 has been removed with the new version. See below for a list of all the supported browsers:
- Internet Explorer 10
- Internet Explorer 11
- Mozilla Firefox (latest publicly released version) running on Windows 8.1 or Windows 8, or Windows 7
- Google Chrome (latest publicly released version) running on Windows 8.1 or Windows 8, or Windows 7, or Google Nexus 10 tablet
- Apple Safari (latest publicly released version) running on Mac OS X 10.8 (Mountain Lion), 10.9 (Mavericks), or Apple iPad
And the supported versions of Microsoft Office:
- Microsoft Office 365
- Microsoft Office 2010
- Microsoft Office 2013
As always be sure to perform the upgrade first in a development or sandbox org to verify that your customizations are still functioning post-upgrade before upgrading your production environment.
