To answer your original question. Office 365 does not require an internet connection. You can save your work offline according to the following.
For Microsoft 365 plans, Internet access is also needed to manage your subscription account, for example to install apps on other PCs or to change billing options. Internet access is also required to access documents stored on One. Drive, unless you install the One. Drive desktop app.
So, you cannot use Microsoft 365 (Formerly Office 365) without an internet connection, unless you have a subscription plan that includes the desktop versions of the classic Office Apps that you are familiar with, and not just the web version.
According to your description, if you only need 2 or 3 weeks with no internet connection. You can use Office normally. If you feel a reply works for you, please kindly vote or mark it as it will be beneficial to other community members reading this thread.
Can Microsoft Office 365 apps be used offline?
While Microsoft Office 365 apps are subscription-based planes and require an internet connection to access and use, Microsoft made several apps desktop-based. This was the time when people realized; they needed an update., and guess what? Word, Excel, and Power. Point are accessible offline .
Do I need an internet connection to use Microsoft Office 365?
However, you have to connect your computer to an internet network from Office 365 migration to Microsoft Office desktop apps, every 30 days. How do I access Microsoft Office 365 without an internet connection ? As I said before, anyone can use the desktop apps by Microsoft Office 365 offline, here I shall say how.
To take full advantage of the Office 365 subscription, you need internet connection. Office 365 subscription gives you 1 TB of cloud storage on One, and drive.
Can I use Office 365 apps without an internet connection?
Yes, we need to first sign in to the Office apps with the Office 365 account under internet connection to activate them. Then we can use the Office apps without an internet connection.
You don’t need to be online to use Office after it is installed and activated on your devices . However, you will need internet access initially to install and activate Office, to install any updates, and to manage your billing. Internet access is also required to access documents stored on One. Drive, unless you install the One. Drive desktop app.
Then we can use the Office apps without an internet connection. Here are the steps to activate the Office apps: Open Word with internet connected > File > Account > User Information > sign in with Office 365 account (which you get the Office apps). Click “Switch account” if it already has signed with another account.
What are the advantages of using Microsoft Office 365?
The advantage is you can access and work on your files from anywhere with an internet connection, for example using a laptop or tablet PC, even a smart phone. Anyway, absolutely it is all about internet access. Office 365 is a web based version of MS Office. Cost range from $5.00 per user up to about $12.50 per user per month.
What if Microsoft 365 plans are not available in my country?
In countries/regions where Microsoft 365 plans are not available, you can still buy an Office 2021 suite, a one-time purchase which includes 2021 versions of the Office apps, but no additional security or storage features.