Q:
Cross Server, Guild missions/Boons
A:
If you refer to the guild changing home servers, all the upgrades will be tied to a specific server – the one where you got them unlocked. It includes missions and guild buffs. That is to say, if you have a mission available on one server, but you transfered to another server, you won’t be able to start that mission. However, if the guild has at least 1 officer on the old server who can start the mission, the guild can complete it while guesting on that old server. You will get commendations, but the merits will go to the old server guild. Unfortunately, this system is buggy currently: for instance, the guild might fail to get credit for Guild Bounty NPCs, if they weren’t hit by a person from the old server, or the mission might fail altogether, even if all the tasks have been completed.
If you refer to the home server and overflows, you should be able to access all the upgrades without any issues.
I don’t known an absolute answer to your question since I haven’t tried it, but our guild completed our latest bounty with one of the targets being captured in Southsun Cove overflow and it counted with the rest being captured on the home server.
Your guild does not exist on guested servers. So I assume not?