A:AnswerCheckout this service manual - http://www.dell.com/support/manuals/us/en/19/inspiron-15-3558-laptop/inspiron-15-3558-laptop/Before-working-inside-your-computer?guid=GUID-5D3B1051-9384-409A-8D5B-9B53BD496DE8&lang=en-us
A:AnswerThis laptop should be good enough for those aforementioned things, the only thing it would maybe need is more RAM (bump up to the max supported of 8GB) if you are going to be heavily multitasking, otherwise should be alright.
A:AnswerIt will depend on which version of MS Office you're trying to install on Windows 10. MS Office 2013 and up will work without any issues. MS Office 2010 will work on Windows 10, there maybe some issues, but anything lower may not install or have compatibility issues as well as not receive security updates anymore.
The MS Office support cycle can be found here: https://support.microsoft.com/en-us/lifecycle/search?sort=PN&alpha=Microsoft%20Office&Filter=FilterNO
A:AnswerYes it comes with a Manufacturers Limited Warranty in which only Manufacturer defects are covered. If a Protection plan is offered you would be wise to take it.
A:AnswerIt's not gonna perform exceptional and you're definitely going to want to upgrade to at least 8GB of RAM.
I'd suggest a laptop that starts with an i5 processor and 8GB of RAM couped with a video card for any serious video editing.
A:AnswerYes, you can transfer everything from an old computer including the OS and it does not matter how you do it but the process is faster with an external hardrive.