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This is a cherry-pick of #44 for the master branch.
Avoid custom UI error like below.
The "TabMail" tab exists only in the ribbon whose id is "Microsoft.Outlook.Explorer". So if we open a ribbon whose id is not "Microsoft.Outlook.Explorer", we may get a custom UI error like "TabMail" doesn't exist. The error is displayed when Outlook's setting "Options" -> "Advanced" -> "Show add-in user interface errors" ("オプション" -> "詳細設定" -> "アドイン ユーザー インターフェイスのエラーを表示する" in Japanese) is enabled.
This patch avoid that error by creating custom UI only when ribbonID is "Microsoft.Outlook.Explorer".
Test