First consult the Evolution Manual.
The evolution-list mailing list is the best place to seek further assistance with using Evolution, for example when you have problems.
The evolution-hackers mailing list is for developer discussions. The topics can get pretty technical.
Many Evolution developers and users can also be found on IRC (irc.gimp.org), channel #evolution.
Evolution in Flatpak
Get the Source Code
The Evolution project releases its source code as tarball files, from which Free Software distributors can create easily-installable binary packages for users.
Most likely your Free Software distribution (Fedora, Mint, Ubuntu, etc.) already provides binary packages for Evolution. The following links are only for the source code.
The latest stable releases are the 3.30 series. Tarballs can be found for these various components (see also the ".news" files accompanying them for a list of changes):
evolution-ews 3.30.x (optional, for Microsoft Exchange servers)
evolution-mapi 3.30.x (optional, for old Microsoft Exchange servers)
The latest development snapshot tarballs (3.31 series, what will become 3.32) can be found below (after the first 3.31 release):
evolution-ews 3.31.x (optional, for Microsoft Exchange servers)
evolution-mapi 3.31.x (optional, for old Microsoft Exchange servers)
Or you can clone the source code repositories with git:
git clone git://git.gnome.org/evolution-data-server (Browse)
git clone git://git.gnome.org/evolution (Browse)
git clone git://git.gnome.org/evolution-ews (optional, for Microsoft Exchange servers) (Browse)
git clone git://git.gnome.org/evolution-mapi (optional, for old Microsoft Exchange servers) (Browse)
You can also view the schedule of upcoming releases.
How to Build Evolution from sources
See all the easy-to-fix bugs in Bugzilla
Bugzilla Topics (used in "Status Whiteboard" entry)
Camel (for email)
The following materials have aged. Some parts are no longer accurate and need a rewrite.
Evolution-EWS (Exchange Web Services)
Exchange Web Services operations feature's parity matrix with /EWS (evolution-ews)
IRC nick names in brackets.