Upgrading WP, Adding BP & Multiple Domains

[d659660]

I've been running a blog via WP 2.6.1 in a sub-folder on one of my domains i.e. mydomain1.com/blog, which I plan to move to mydomain1.com

I'm also planning to update from WP 2.6.1 to WP 3.3.1 and I'd ultimately like to add WP and/or BuddyPress to multiple domains (all separate entities & topics i.e. mydomain1.com, mydomain2.com, mydomain3.com) so, I've backed up my current blog's Database & Files and disabled my plugins but have a few questions:

1) Do I need to upgrade my hosting account to the required versions of PHP and MySQL BEFORE I update from WP 2.6.1 to WP 3.3.1?

2) Currently, I go to mydomain1.com/blog/wp-login.php to administer my one blog. Where will I go to administer WP and/or BP on multiple domains after adding them?

3) My current theme doesn't appear to be available in the WP Theme Directory, how will updating to WP 3.3.1 affect my current them?

4) What else should I be concerned about before upgrading from WP 2.6.1 to WP 3.3.1?

Thanks!

[bunltd]

1) yes, you need to be on a server that supports the latest version of WordPress before you upgrade - it won't work otherwise.

2) you'll login where you install it. I'm guessing you're planning on creating a network [codex.wordpress.org] and then mapping domains [wordpress.org]

3) The only way to answer this is to test your current theme against the latest version of WordPress. (you could create a copy of your site on a development server for testing)

4) backup everything before you even attempt the upgrade. Everthing means all files on the server plus a complete database backup.