Chinesenin

Hello Martin,
Thank you for posting your query on Microsoft Office Community.

I understand your concern and will assist you with this issue.
Since you've mentioned that you're unable to start Excel for iPad, let's reset it following steps mentioned below, then try starting it and verify the result.
Close all the Office apps:

• Ipad Can't Download Apps Waiting
• Ipad Wont Download Apps Waiting For Pc
• Download Ipad Apps For Free
• Apps Won't Open On Ipad

1. Go to iPad Settings.
2. In Settings, tap to select Word app for iPad.
3. Under RESET, tap Reset <app name>.
4. Slide to enable Delete Login Credentials.
5. Start Excel for iPad app.
6. Sign in using your Microsoft account.
7. Now try editing and verify the result the result.

Apr 10, 2014  When you want to install an app from the App Store on your iPad or iPhone, it is usually a quick process to download and install the app. However, apps occasionally get stuck waiting, never progress, and nothing happens (like the image below). Your iPhone Not Downloading Apps? Fix App Stuck on Waiting, Updating or Loading on iPhone or iPad.

Hope it helps. Keep us updated on the status of the issue and I'll be happy to help you further.
Thank you.

Ipad Can't Download Apps Waiting

This answer did not work.

Ipad Wont Download Apps Waiting For Pc

I resolve the issue in the following manner:

1. My iPad is backed up on iTunes. This is a pre-requisite.

Download Ipad Apps For Free

2. Remove the old version of Excel on iPad via iTunes

3. Update to the latest version of Excel on iTunes (see Apps Update)

4. Select Install Excel on iPad

5. Sync iPad with iTunes

Apps Won't Open On Ipad

In this way the latest Excel version is copied to the iPad and works perfectly.