How can I upgrade all plans on all customer accounts easily?

If you edit a existing package in whm, then once saved, all the domains that are assigned to that package should get any feature you have changed. All ours work this way.

 

ya, the only problem with that is that if you have customized the quota for an account(s) using that package, your customization will be undone when you update the package. I discovered that when the only way I could find to give one account (of many using a specific package) a few extra email accounts was to edit the package itself. There's likely a better way but that was all I could find.

 

"ya, the only problem with that is that if you have customized the quota for an account(s) using that package, your customization will be undone when you update the package."

This is true, thats why you should create a new package for anyone that has been customized and assigned to it. Then if you update a package, it will never be over written.

 

What I do about that is have a plan I called "custom". Any customized accounts I put on that plan, then custiomize each one to what I want. I just never make any changes to that plan.